Taric should get bonus stats from different sight stones
Ruby should give him 5% extra hp, AD and armor Sapphire should give him 5% extra mp, AP, and MR Emerald should increase ward range by 15% and 10% ward vision Opal should increase healing done by 15% and +10 flat MS
Or just make these the new sight stone enhancement to make sight stone worth buying instead of greater stealth totem.